Artist's impression of Czechoslovak-built Avia B-534-IV in Luftwaffe service, 1939.  This was the penultimate version of the aircraft; one later, cannon-armed version was produced (although I am not sure whether it ever saw combat).  JR.

Avia B-534-IV in German service.

Luftwaffe photo of the aerial bombing of Stalingrad, August 1942.

Bombing of Stalingrad

Heinkel He 112 B - hardest competitor to the Me (Bf) 109 for the standard fighter plane of the German Luftwaffe. The Me was cheaper and easier to produce, the He 112 was more stalwart and aerodynamically superior though.